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We have chosen to implement the PCI address access to obtain compatible source code to the port the driver on a PowerPC target. This thread is event driven. We have used this paging mechanism, with 4Kb page. Vitaly Popovich Posted On June 5, TechGenix reaches millions of IT Professionals every month, and has set the standard for providing free technical content through its growing family of websites, empowering them with the answers and tools that are needed to set up, configure, maintain and enhance their networks. Because the DEC chip uses the host memory to store the incoming frame and because the DEC configuration registers are mapped into the PCI address space, we must ensure that the data read or written by the host processor are the ones written or read by the DEC device in the host memory and not old data stored in the cache memory.

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I understand that by submitting this form my personal information is subject to the TechGenix Privacy Policy. By reading or writing these registers, a driver can obtain information about the type of the board, the interrupt it uses, the mapping of the chip specific registers, … On Intel target, the chip specific registers can be accessed via 2 methods: This board includes an Ethernet controller based on a DEC chip. Here is a non exhaustive list of adapters which support this driver:.

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First draft of this document Planned releases: We have used this paging mechanism, with 4Kb page. This thread is also event driven.

Once this operation performed, the driver is able to extract the information it needs to configure the board internal registers, like the interrupt line, the netwwork address,… The board internal registers will not be detailled here.

Many Ethernet adapter cards use the Tulip chip. Testing the Driver 6. Over 1, fellow IT Pros are already on-board, don’t be left out!

To reference these buffers to the DEC chip we use a buffer descriptors ring. To achieve it, we have chosen a Motorola MCP board. In this chapter will see the initialization phase, how the controller uses the host memory and the 2 threads launched at the initialization time.

Early versions used National transcievers, but later versions are depopulated ZX boards. All the buffers allocated to store the incoming or outcoming frames, buffer descriptor and also the PCI address space of the DEC board are located in a memory space with cache disable.

The most trusted on the planet by IT Pros. Each descriptor can reference one or two memory buffers.

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We use Netboot tool to load our development from a server to the target via an ethernet network. We plan to port the DEC driver for the Netboot tool. This allows not to lose too much memory or not to disable cache memory for a page which contains other data than buffer, which could decrease performance.

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First version of this document. Because we use only netwodk transmit buffer, we are sure that the frame is well-sent before sending the next.

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Once the attach function executed, the driver initializes the DEC chip. Each time an Ethernet frame is put in the transmit queue, an event is sent to the transmit thread, which empty the queue by sending each outcoming frame.

Notify me of follow-up comments by email. This DEC chip uses the host memory to store the incoming Ethernet frames and the descriptor of these frames. Netboot DEC driver 7. We have used it nework configure the board. Because the DEC chip uses the host memory to store the incoming frame and because the DEC configuration newtork are mapped into the PCI address space, we must ensure that the data read or written networ the host processor are the ones written or read by the DEC device in the host memory and not old data stored in the cache memory.

We have chosen to use 7 receive buffers and 1 transmit buffer to optimize memory allocation due to cache and paging problem that will be explained in the section Encountered Problems. By reading or jetwork these registers, a driver can obtain information about the type of the board, the interrupt it uses, the mapping of the chip specific registers, …. Network Task Structure and Data Flow 3. List of Ethernet cards using the DEC chip 8.

DEC Driver Introduction 7.